Ay ganyan talaga ang transition, mama! Usually sinisimula mo ng 1-2 scoops ng lactose-free (S26) mixed with the old milk for a few days, then gradually increase the lactose-free ratio hanggang pure na siya, pero honestly, best to follow exactly what your pedia said kasi alam nila ang specific case ng baby mo. Some babies need slower transition, iba kailangan ng mas mabilis, depende talaga. Goodluck, hopefully maayos ang tummy ng baby once you nail the ratio!